What is the method for positioning AgGrid's total row at the top?

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To position AgGrid's total row at the top, you can use the property floatingTopRowData and set it to an array containing the data for the total row. This will create a floating top row that will always be displayed at the top of the grid. Here's an example:

gridOptions = {
    // other grid options...
    floatingTopRowData: [totalRowData],
    floatingTopRow: true
};

Make sure to set floatingTopRow to true as well, as this enables the floating top row feature. You can customize the appearance of the floating top row using CSS.